FILE - In this Thursday, Oct. 19, 2017 file photo, Britain's Labour Party leader Jeremy Corbyn delivers a speech prior to a meeting of European Socialists prior to an EU summit in Brussels. The leader of Britain's opposition Labour Party has said on Tuesday, Feb. 20, 2018 a claim that he gave information to a Czechoslovak spy during the Cold War is "a ridiculous smear." Jeremy Corbyn says claims in British newspapers "are increasingly wild and entirely false." (AP Photo/Geert Vanden Wijngaert, file)

The Sun tabloid last week published details of documents from Czechoslovakia's intelligence archives which, it said, showed Corbyn had met an agent three times in the 1980s. Other newspapers have repeated the claims.

In a social-media video Tuesday, Corbyn said the stories were being spread by rich media barons worried by the prospect of a left-wing Labour government.

Corbyn's office acknowledged that he had tea with a Czech diplomat, but said any claim he was "an agent, asset or informer for any intelligence agency is entirely false and a ridiculous smear."